package com.zyh.dao;

import com.zyh.po.Blog;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

//主键对象 值为类型
public interface BlogRepository extends JpaRepository<Blog,Long>, JpaSpecificationExecutor<Blog> {

    @Query("select b from Blog b where b.recommend =true")//查询推荐的博客
    List<Blog> findTop(Pageable pageable);

    @Query("select b from Blog b where b.title like ?1 or b.content like ?1")
    Page<Blog> findByQuery(String query,Pageable pageable);

    @Transactional
    @Modifying
    @Query("update Blog b set  b.views = b.views +1 where b.id=?1")//更新显示次数
    int updateViews(Long id);

    @Query("select  function('date_format',b.updateTime,'%Y')as year from Blog b group by " +
            " function('date_format',b.updateTime,'%Y') order by year desc ")//根据日期格式化的语法时间年份分类博客
    List<String> findGroupYear();

    @Query("select b from  Blog b where function('date_format',b.updateTime,'%Y') = ?1")
    List<Blog> findByYear(String year);
}
